# Expression pedal won't calibrate correctly (Dunlop DVP4 Volume (X) mini)

**URL:** <https://unity.neuraldsp.com/t/expression-pedal-wont-calibrate-correctly-dunlop-dvp4-volume-x-mini/12288>\
**Category:** Quad Cortex\
**Created:** [October 19, 2023, 10:23pm UTC](https://unity.neuraldsp.com/t/expression-pedal-wont-calibrate-correctly-dunlop-dvp4-volume-x-mini/12288 "2023-10-19T22:23:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![SoundWrangler](https://avatars.discourse-cdn.com/v4/letter/s/65b543/32.png) [@SoundWrangler](https://unity.neuraldsp.com/u/SoundWrangler)\
**Post date:** [October 19, 2023, 10:23pm UTC](https://unity.neuraldsp.com/t/expression-pedal-wont-calibrate-correctly-dunlop-dvp4-volume-x-mini/12288/1 "2023-10-19T22:23:32Z")

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Maybe you can help me with the internal switch settings on the dvp4-volume-x-mini-pedal ?  
At the moment I have the top switch set to _Exp_ (to the right) and the bottom switch also to the right… and of course connected from the Aux out of the pedal to the QC expression input with a TRS cable (same result with multiple cables as well as with 2 identical pedals). When I try to recalibrate, the Position knob just sweeps up to .50 and sticks there instead of 0-100 as it should when I rock the pedal. After I save, it just sweeps from .040 to 0.60. (Using Core OS 2.2.0, BTW) Any ideas? I’ve tried every combination and a Boss EV-5 pedal works just fine. Thanks!

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**Author:** ![AZMustang33](https://avatars.discourse-cdn.com/v4/letter/a/ac91a4/32.png) [@AZMustang33](https://unity.neuraldsp.com/u/AZMustang33)\
**Post date:** [August 13, 2025, 9:35am UTC](https://unity.neuraldsp.com/t/expression-pedal-wont-calibrate-correctly-dunlop-dvp4-volume-x-mini/12288/2 "2025-08-13T09:35:38Z")

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I’m pretty late on this, but I just had this same issue. Ended up being able to calibrate it by plugging into the aux port.